Democratic Republic of the Congo: Gunmen attack east Congo army base, at least 31 dead

• Underlines task facing new U.N. intervention force

• Mai Mai rebel groups fighting over land, resources (Adds details)

KINSHASA, May 15 (Reuters) - At least 31 people were killed when gunmen attacked an army base in eastern Democratic Republic of Congo on Wednesday, the military said, underlining the challenge facing a new U.N. intervention force in the territory.

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